ANALOG DEVICES AD4857 Buffered 8-Channel Simultaneous Sampling User Guide
- July 16, 2024
- Analog Devices
Table of Contents
- AD4857 Buffered 8-Channel Simultaneous Sampling
- FEATURES
- EQUIPMENT NEEDED
- SOFTWARE NEEDED
- EVALUATION BOARD KIT CONTENTS
- EVALUATION BOARD PHOTOGRAPH
- GENERAL DESCRIPTION
- EVALUATION BOARD HARDWARE
- EVALUATION BOARD SCHEMATICS AND ARTWORK
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
User Guide
EVAL-AD4857
UG-2242
AD4857 Buffered 8-Channel Simultaneous Sampling
Evaluating the AD4857 Buffered, 8-Channel Simultaneous Sampling, 16-Bit 1 MSPS DAS
FEATURES
► Full featured evaluation board for the
AD4857
► 8 input channels available through SMA connectors
► On-board reference circuit and power supplies
► Standalone capability through FMC connector and/or test points
► PC software for control and data analysis of the time and frequency domain
► ZedBoard-compatible
► Compatible with other FMC controller boards
EQUIPMENT NEEDED
► PC running Windows® 10 operating system or higher
► Digilent ZedBoard with 12 V wall adapter power supply
► Precision signal source
► SMA cables (inputs to evaluation board)
► USB cable
SOFTWARE NEEDED
► Analysis | Control | Evaluation (ACE)
Software
► AD4857 ACE plugin from plug-in manager
EVALUATION BOARD KIT CONTENTS
► EVAL-AD4857FMCZ evaluation board
► Micro-SD memory card (with adapter) containing system board boot software
and Linux OS
EVALUATION BOARD PHOTOGRAPH
GENERAL DESCRIPTION
The EVAL-AD4857FMCZ is designed to demonstrate the performance of the AD4857
and to provide access to many included configuration options that are accessed
via a simple ACE plug-in graphical user interface (GUI). The AD4857 is a fully
buffered, 8-channel simultaneous sampling, 16-bit, 1 MSPS data acquisition
system (DAS) with differential, wide common-mode range inputs.
The EVAL-AD4857FMCZ on-board components include the following:
► The LTC6655 high precision, low drift,
4.096 V voltage reference (not used by default)
► The LT1761, low noise, 1.8 V, 2.5 V, and 5
V low dropout (LDO) regulators
► The LT8330 low quiescent current (I ) boost
converter
For full details on the AD4857, see the AD4857 data sheet, which Q must be
consulted in conjunction with this user guide when using the EVAL-AD4857FMCZ
evaluation board.
REVISION HISTORY
6/2024—Revision 0: Initial Version
QUICK START GUIDE
Take the following steps to begin to evaluate the EVALAD4857FMCZ:
- Download and install the ACE Software from the ACE web page. If ACE is already installed on the computer, ensure that the latest version is being used by clicking the Check For Updates icon in the ACE Software sidebar, as shown in Figure 2.
- Run the ACE Software, select the Plug-in Manager from the ACE sidebar to install the board plug-in that supports the AD4857 evaluation board, and select Available Packages, as shown in Figure 3. You can use the search field to help filter the list of boards to find the AD4857 board. See the ACE Quickstart – Using ACE and Installing Plug-ins guide for additional information.
- Insert the Micro-SD card (with the adapter) that was provided in the evaluation board kit into the SD card slot on the underside of the ZedBoard. If there is a requirement to reimage or create a new Micro-SD card, see the following instructions found on the Analog Devices, Inc., website: ADI Kuiper Linux with support for ACE Evaluation.
- Ensure the ZedBoard boot configuration jumpers are set to use the Micro-SD card as shown in Figure 4. To avoid potential damage when JVIO is changed as described in Table 1, ensure that the VADJ SELECT jumper is set to the correct voltage for the EVAL-AD4857FMCZ.
- Connect the EVAL-AD4857FMCZ to the FMC connector on the ZedBoard.
- Connect the USB cable from the computer to the J13/USB OTG port, and connect the 12 V power supply to J20/DC input.
- Slide the SW8/POWER switch in the ZedBoard to the on position. The green LD13/POWER LED turns on and is followed by the blue LD12/DONE LED (within the ZedBoard). The DS1 LED in the EVAL-AD4857FMCZ also turns on.
- The red LD7 LED blinks approximately 20 sec to 30 sec later, indicating that the boot process is complete.
- Launch the ACE Software from the Analog Devices folder in the Windows Start menu. The EVAL-AD4857FMCZ appears in the ACE Start in the Attached Hardware view, as shown in Figure 5.
If the EVAL-AD4857FMCZ does not appear on the Attached Hardware view, the plug-in can still be launched from the Explore Without Hardware menu. Click Proceed To Documentation to open the plug-in documentation for troubleshooting help as well as descriptions of each window and features within the plug-in.
QUICK START GUIDE
EVALUATION BOARD HARDWARE
The AD4857 is a fully buffered, 8-channel simultaneous sampling, 16-bit 1 MSPS DAS with differential, wide common-mode range inputs. The AD4857 has an on- chip low drift 4.096 V internal voltage reference; however, it also optionally accepts an external reference applied through the REFIO pin and provided to the on-board LTC6655. The device operates from different power rails, provided through on-board LDO regulators as described in Power Supplies section. An option to connect external supplies exists and is explained in Table 1.
HARDWARE LINK OPTIONS
Table 1 details the link option functions and the default power link options.
The EVAL-AD4857FMCZ can be powered from different sources, as described in the
Power Supplies section. By default, the power supply required for the EVAL-
AD4857FMCZ comes from the ZedBoard controller board. The power supply is
regulated by the on-board regulators that generate the required bipolar
supplies.
Table 1. Jumper Details with the Factory Default Settings
JODIFF to J7DIFF| Not inserted| Offset Calibration Jumper. Inserting the
JODIFF to J7DIFF jumper link allows short circuiting the corresponding pair of
inputs to measure the AD4857 offset and/or to perform an offset calibration.
---|---|---
J0+ to J7+| Not inserted| Analog Input to Ground Connection. Insert the J0+ to
J7+ jumper link to connect to the AGND pin, the corresponding positive analog
input.
J0− to J7−| Not inserted| Analog Input to Ground Connection. Insert the J0− to
J7− jumper link to connect to the AGND pin, the corresponding negative analog
input.
JV12V| A| The JV12V link selects the power supply source for the EVAL-
AD4857FMCZ evaluation board.
In Position A, the unregulated supply to the on-board LDO regulators is taken
from the ZedBoard 12 V supply.
In Position B, the unregulated external supply to the on-board LDO regulators
is taken from the V12V_EXT connector.
JSHIFT| A| The JSHIFT link selects the power supply type for the AD4857. In
Position A, the VCC pin = +24 V, and the VEE pin = −24 V.
In Position B, the VCCpin = +44 V, and the VEE pin = −4 V.
If not inserted, the VCC pin = +24 V, and the VEE pin = −4 V.
JVCC| A| The JVCC link selects the VCC pin supply source.
In Position A, the VCC pin is provided by the on board LT8330
DC/DC converter. In Position
B, the VCC pin is provided though VCC_EXT connector.
JVEE| A| The JVEE link selects the VEE pin supply source.
In Position A, the VEE pin is provided by the on-board LT8330 DC/DC converter.
In Position B, the VEE pin is provided though VEE_EXT connector.
JVDDH| A| The JVDDH link selects the VDDH pin supply source.
In Position A, the VDDH pin is provided by the on board LT1761
2.5 V LDO regulator. In
Position B, the VDDH pin is provided though VDDH_EXT connector.
If not inserted, the VDDH pin can be tied to the AGND pin by inserting an R40
resistor. To disable the internal LDO regulator, tie the VDDH pin to the GND
pin. With the regulator is disabled, connect the VDDL pin to an external
supply in the range of 1.71 V to 1.89 V through the JVDDL link.
JVDD| A| The JVDD link selects the VDD pin supply source.
In Position A, the VDD pin is provided by the on-board LT1761 5 V LDO
regulator. In Position B, the VDD pin is provided though VDD_EXT connector.
JVDDL| Not inserted| The JVDDL link selects the VDDL pin supply source.
In Position A, the VDDL pin is provided by the on-board LT1761 1.8 V LDO
regulator. To use this configuration, tie the VDDH pin to ground through the
JVDDH link.
In Position B, the VDDL pin is provided though the VDDL_EXT connector. To use
this configuration, tie the VDDH pin to ground through the JVDDH link.
If not inserted, the internal LDO regulator is used for the JVDDH link to be
in Position A or Position B.
JVIO| Not inserted| The JVIO link selects the VIO pin supply source. If not
inserted, the VIO pin is taken from the ZedBoard (default). Alternatively, the
VIO pin can be supplied from either the on-board LDO regulators or an external
supply.
In Position A, the VIO pin is provided by the on-board LT1761 LDO regulator
with an output voltage dependent on the JVIO_LDO link. The R66 resistor (shown
in Figure 7) is unsoldered.
In Position B, the VIO pin is provided though the VIO_EXT connector. The R66
resistor is unsoldered.
Note the field programmable gate array (FPGA) image provided works at a 2.5 V
digital level; therefore, use caution when changing the default position of
the JVIO link jumper.
---|---|---
JVIO_LDO| Not inserted| The JVIO_LDO link selects the LT1761 LDO regulator
output voltage when the JVIO link is in Position B. Inserted, the LT1761
output voltage is 3.3 V.
Not inserted, the LT1761 output voltage is 1.8 V.
CONNECTORS AND SOCKETS
The connectors and sockets on the EVAL-AD4857FMCZ are outlined in Table 2.
Table 2. On-Board Connectors
Connector | Function |
---|---|
SMA0+ to SMA7+ | Positive analog input Subminiature Version A (SMA) to Channel |
0 through Channel 7
SMA0− to SMA7−| Negative analog input SMA to Channel 0 through Channel 7
P1| FPGA mezzanine card (FMC) connector
POWER SUPPLIES
The ZedBoard supplies 12 V to power the rails for the different components on
the EVAL-AD4857FMCZ. The AD4857 uses the following five power supply pins:
► Positive high voltage power supply (the VCCpin)
► Negative high voltage power supply (the VEEpin)
► Low voltage power supply (the VDDpin)
► 1.8 V power supply (the VDDLpin)
► Digital power supply (the VIOpin)
A combination of the LT8330
DC/DC converter and the
LT1761 LDO regulator
generate all the needed supply rails on the board.
Table 3. Default Power Supplies Available in the EVAL-AD4857FMCZ
Power Supply (V) | Function | Component |
---|---|---|
+24 | VCC | LT8330 |
−24 | VEE | LT8330 |
+2.5 | VDDH | LT1761 |
+5 | VDD | LT1761 |
+1.8 | VIO | LT1761 |
REFERENCE CIRCUIT
By default, the AD4857 in the EVAL-AD4857FMCZ uses the internal low noise, low
drift (10 ppm/°C maximum), temperature compensated band-gap reference that is
factory trimmed to 4.096 V and the internal reference buffer.
As an optional alternative, an
LTC6655 high precision, low
drift (2 ppm/°C maximum), 4.096 V voltage reference is also provided. This
external reference can be used in two different configurations, as explained
in the AD4857 data sheet and as follows:
► External reference with internal buffer. For this configuration, connect the
external reference to the REFIO pin and populate the R62 resistor shown in
Figure 7.
► External reference with disabled internal buffer. For this configuration,
connect the external reference to the REFBUF pin and populate the R46 resistor
shown in Figure 7 and also connect the REFIO test point to ground.
EVALUATION BOARD SCHEMATICS AND ARTWORK
![ANALOG DEVICES AD4857 Buffered 8-Channel Simultaneous Sampling
- Power Solution Schematic](https://manuals.plus/wp-content/uploads/2024/07
/ANALOG-DEVICES-AD4857-Buffered-8-Channel-Simultaneous-Sampling-Power-
Solution-Schematic.jpg)
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit
boards can discharge without detection. Although this product features
patented or proprietary protection circuitry, damage may occur on devices
subjected to high energy ESD. Therefore, proper ESD precautions should be
taken to avoid performance degradation or loss of functionality.
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